Gastrointestinal perforation in anti-NXP2 antibody-associated juvenile dermatomyositis: Case reports and a review of the literature
Abstract Background: To summarize the characteristics of gastrointestinal (GI) perforation in anti-NXP2 antibody-associated juvenile dermatomyositis (JDM). Methods: Five patients with GI perforation from a JDM cohort of 120 cases are described. Relevant literature was reviewed. Results: Five patients, including 4 females and 1 male, were involved in the study. The average age of the 5 patients was 5.74 years (5.74 ±2.82). Myositis-specific antibody (MAS) spectrum analysis indicated that the five patients were anti-NXP2 antibody positive. The initial symptoms of GI perforation were progressive abdominal pain and intermittent fever. Two patients also presented with ureteral calculus with hydronephrosis and ureteral stricture. Surgery was performed in four patients, which was successful in only one patient through fistulization. Four patients died (4/5, 80%), and 1 patient was completely relieved after 2 years of treatment. Combined with 16 patients described in the literature, the onset symptom was progressive abdominal pain, which often occurred within 10 months after JDM was diagnosed. Perforation most often occurred in the duodenum, although perforations at multiple sites or recurrent perforations also occurred. The mortality rate of GI perforation in JDM was 38% (8/21). Conclusions: All perforation cases subjected to MAS analysis were anti-NXP2 antibody positive. The onset symptom was abdominal pain. The most common site of perforation was the duodenum in the retroperitoneum, and the lack of acute abdominal manifestations complicated early diagnosis. GI perforation is a fatal complication in JDM, and early diagnosis is very important. More research is needed to determine the pathogenesis and predictive factors of GI perforation in JDM.